An apostle of the liturgy, Letourneux wished to revitalize the emotional link between the faithful and the liturgy. Through commentaries destined to inspire the sentiments of Christians, he scrutinizes a semiotic mystery that unfolds within the liturgical time frame. In the spirit of theological esthetics as analyzed by Ursvon Balthazar, he studies its disposition of this mystery. The present study focuses on the Good Friday liturgy, seemingly irrelevant to any aesthetic approach, since the extreme sobriety of expressive modes on this day is the enactment of a veritable dramaturgy of the Passion of Christ. Religious sentiment, merging with mystagogy, consacrates the paradoxical beauty of the marred Servant, in a dimmed glory where the death and resurrection of the Sign, as it were the Passover of all Christian esthetics, are acted out.